The diesel cycle is more efficient (greater compression ratio) and so you tend to use less fuel than you would with a petrol. On top of this the fuel price is lower, though the ratio of prices has changed over the last 20 years when diesel was just under half the price of petrol where now it is about three quarters the price. I managed 9.5l/100km with the Bighorn the other weekend on a trip to Dunedin and back which isn't too bad. The big Mercedes Sprinter surprised me with 8.8l/100km. Personally I prefer the way a diesel drives with its low end torque.
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